It's "poetic" (or evocative) but I wouldn't call it a poem because it has no poetical structure. In fact if anything it's as un-poetry like as prose can get - if you compare to other kinds of prose, particularly rhetoric. I remember back in English class we were once showed a "poem" that turned out to be a passage of Thomas Hardy written out in blank verse. It worked pretty well. I guess you could try that here:
Nearly works. Not quite there for me, though. Perhaps if: When I finally caught up with Abraham Trahearne
He was drinking beer
With an alcoholic bulldog named Fireball Roberts
In a ramshackle joint just outside of Sonoma, California
Drinking the heart right out
Of a fine spring afternoon.
That's more a "poem" to me. Abraham Trahearne
Drinking beer
On a fine spring afternoon
In a ramshackle joint
With Fireball Roberts
Drinking the heart right out